SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7572dbe3d68406ba5ff4a8dded6478c39664b4e6f1ac7753ec27dd569d2e7baa' 
  AND token = 'BYu+z+14TpK9XEqUCgb+2H/h+UbrBeejjw0q4buuypQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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