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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a164be156837be3e489d89fa595762a1484b9bd6ca1b8be07802cac173438dc0' 
  AND token = '87gdE00hYs2ja2y1426v9sd2q0PaUUrrKKw5ZzNRM40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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