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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1929fda6b84a461a704f08183bd8e24830d6cd415ea73725406d27dbe225b4d2' 
  AND token = '7sWP9jPFGh/aDjCrq9SWzOHiRMPeAM2sidxQhKtpvQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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