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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9901c31c11ca15214e34e3ad776012a9498e889ff6f91d0da0eb7bc3142834' 
  AND token = '79CpYeEOhBRSa2RHQ2Gy1dJ7m2yL13oNzH1I3EpfVM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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