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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927a008c2672a61502fd49d94b9da589ee18ff114a17394f2b5a95db60fcad7c' 
  AND token = 'etirmuYosbHPmmFuQRL1HNLXutp2qP4T07j+HpHU4RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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