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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e168bd7026c2cd9d44324fc148865f57b45b882cfc4111b263c03cde16c9aafe' 
  AND token = 'WdCZ0zYIEe4GdrbhaC07ly2EAQvBHQ5q9v/3fQo02OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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