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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e0ee92363f92dcd90ca34f0150f1a96c9d146e33cb9c16ef18827a97c96e62' 
  AND token = 'jYBwwPykgrvHKggq+UY0pik1NsplanlDp0CxatKMHSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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