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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ba6bbd8e702d4d6972b8980cebde6f09abf7dd259830339e80b65c5cdf523a' 
  AND token = 'zDqL94oehKkfabD3egQ0uuYlS9covC2y0pLug8N0U7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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