SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ca92160da5b98ce9b6b734287b194d79554c16b89691a0ca0145015e893190' 
  AND token = '2mvkNmFRgXpjZRZYolWgVvmoBqhW8F5e0GQxKhQBm/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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