SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212b8e58579b64bf763e602b547cc65b925bc6466f0a1d013a75812d62a33636' 
  AND token = 'vDIHbjnLCTLdgJwwlpyUZ0+3YC+ABjw3iCfF0AhpIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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