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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc13ad7a6d436c7672db675963455476e215926e44eff7bc7eed332f2739b87' 
  AND token = 'IlVt1OnSV3y2DxZnryG0kcI55Z+N7TE6dX3+6TtiWwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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