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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d4806151bf0d5a04d0ce4953e3749c79c75839218ece3e821b6f5532c32c5c' 
  AND token = 'I5Zqj5O3wIfKsDx5eq9Ssj370ag6kUdTQhhq9WZaA94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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