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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93722c25a089adcce2c1b539b61d4a635d060b75af8c0ffa17b53d22805a7711' 
  AND token = 'CT4j/dUQXVuC3vu8mX0ezXvc/QaHksIPvMDTSXrydmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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