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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320f57546762083fa434f418668c227d04329684f1ee5fea4aed5c5156b04164' 
  AND token = 'OsGaRRkIbU3zgizpj6u/w697imo8D718DnUuAJs9X6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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