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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b85d7256dfd47adcecc6ce8416da1444d7450b27615c1546b0add96619dbd4' 
  AND token = 'pQGoQDdBpgT7fn/+rcMjf4fIxfUVNtpXKe1XC6dxSUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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