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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67252bc3dcbacdeea157d1b2b4a6976b402fc3e39a725df65af92719b484b08' 
  AND token = 'AL5/4F952xnjm7BWQ1HrtdG4RzEt9ZwOPrAcAgcc2tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}