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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d9e6d8779027c224434f5e40be081222a9f0e1ac8a75fa780b343ec75415f3' 
  AND token = '4jRq/PSyMq8ylicB1eyh8wMj3Hb+UUk12ZLK7Tdb5UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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