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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc48e6d880427de3f3a7eb8da978614396579289f3ca80070e09efe20d91339e' 
  AND token = 'Rx4KVQk1CSFfNT1MsSxr5PRD8IfA6ShxfDh317ReInc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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