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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9bbc3db83dd04d40da995c82d4110c2ac24f6b9c497b12ff46d2709d4af583' 
  AND token = 'GinQBYhf3IDltPCz4tmqcbs5wuiR6KsOtKVAmbCutj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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