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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a1e57bc5cc98281cb56ea7d9972150bf276da729d9b46c98a503c885999cfa' 
  AND token = '2L3QmnxpOCcmUjwBzhs52XLRKI2uqIMlUWixKJa4IpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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