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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56a70e46cb9160d278ad17a90079bfea61a585f34840e71eb50cc0bcfdf8e15' 
  AND token = 'FF+Gk+F3IszpsUlZBal048YJSu54TcLiXc89+fwrF2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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