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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfc9847cbc94bb2a04823a84799a3177a0fcf3d1b9800e9bf69981ff65a363b' 
  AND token = 'yGIlhNkAFL19+PQciyyvmJ+T7dPZ8Uh1jLiO9H8Zoz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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