SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e9b265d38abb0d2705a184635ed5f863dfcc3d08be6598af45c23aaed29d80' 
  AND token = 'ZSRn+wLNm11LYTC/w4LG8fTOAmpLUP/ohMz4k+jNdFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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