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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482075999fd280f4a2e8e15c184d07edd9d71278aafdc947aa6c32bab40e74dc' 
  AND token = 'J6+4bRmYygoEZ7f5Z9R9HfB7AHPsUG9XKneseHIGPjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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