SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15a17e4e403f746fdb44246fe93902afe101d6e87433eafb0f5550515516e0b' 
  AND token = 'G9vnJuIAvZvfrGRCLPTmYqSwl3nsbVIaJ17HHJjzqUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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