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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db25b82d4db88cc8d96d2e07d7515d51970ae307d30a6493701b12915439caf8' 
  AND token = 'Dl0IPlK8wUjGddVCw0P8j4S0RZl+3G0t1XdHmscHiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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