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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed025a326fd56cb9c81712e5c4074a4654b8edd3447ae29404fba08a24656559' 
  AND token = 'XffthqMQ2FhbwOKmDsN7Lgi1pfqXsKbaYc5BDiA+hMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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