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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8286255a51cb0ee376c8542f35bd76493122f0503826a817081d33734388ec' 
  AND token = 'Fidu/wm8VXcJHwGMz6dPmbE7N9qeCbBN56i+wHd+D+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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