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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72eac4bcaae24a2f1ce8e96f02664c27aea72b83420115951946b032627fd96c' 
  AND token = 'jluFgyBYzhqDX6iGgia1oaml2Agpt4I2v/QDwxISKfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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