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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032827ee942360dd7f813bf283f7c84427a72b81f6ea8921a96bd5b3405eaf7b' 
  AND token = 'QZUx9jA6g/4AJd/TP9ZiiHUg55uh3O9yYTTLL2YCbS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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