SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ee941e7787522ba4438371b7b9eab218448f024975312b0cf04fd36b89c44d' 
  AND token = '+ujIhUr5BLAy0b4o4hGeK9wwmMxdzUiKHr/mV/CbZ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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