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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cbf15eaf3e2f881f258392a26448614ffdeb7830b212b8fc7761cc7ba8a6bf' 
  AND token = 'BRa67EDJ6c6+4JmJXgKmLHUocZKhN81GNb94y9vHV6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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