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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2706500329bc14b90139db636ec32f63f9f3f3586282be3217384e46bc1085c3' 
  AND token = 'l2kyMlmAtdsxkfp4ZlLgYWDVLOP4/K4WOTEci1hVcds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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