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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8513f48d60558d73a6ac4d1cb91247934df9d51e8c93906790287c133e631a6' 
  AND token = 'BydmFJVEA6SRRutR19PGUF9zU40q+eZqljdbLqY1Z5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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