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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed40e2bf81a94bbd18ef6b717e0e6890acaf7f8306c6d205c88143abd8472c2' 
  AND token = 'fwLm9j9gIii+EWgqGeL29DItrl8Q846T/Reb9oE2ojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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