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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7efc0dc8adb2b91e7ab3b1cf8fdfa3b8952f95f4e3a3f35fbd73d2024ded1f9' 
  AND token = 'LAnQ9W9EAdsvgeeqTqj0JX4V6aBpgC9D9uty+hyFFtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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