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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50486b2c6f1ef27db29dd07721207e09fa9d526ed8c3738fc73c0afe41b99b62' 
  AND token = 'SoYnwKQP1eXXLL1cSpAbaBD6avJOrEklpAQt7RtYEaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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