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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7134de85adc9f6c86ae21708b3c1df2bf39d741e8b23cb7a16aaaf9a26c7f9' 
  AND token = 'ys9S3UDorKKqD4iqC02v38XcoLut0odA4GMFQqIJ8Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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