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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d81f7e7d8adf89b86bf4a1f1abc07ff3b178665e0b7bb1c7b4b407aff06b110' 
  AND token = '3WX15pcoRxv9zMk0arwbehf/VGHwK670inpEi7hWF5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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