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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204e2e3e54244b90ef357e4554d8cf2d656bb106d8d454ab93c75f41d4617a58' 
  AND token = 'LAIY4Vu+E7QYnX0rZgxf4r8cALoWhCzEiGpbM1YmjW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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