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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffbab6b256a9b85d75bdc7fac9c668602c65a76e469d32cbbb1ee06901b9466' 
  AND token = 'BH69KvsqHxt+e0doMwRDcElGZR/vx/dgIa5ntVMQqrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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