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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8b9b9671549a88b05394a8031d770be74b80c881f3ec48d976a50f1c77b23a' 
  AND token = '4OlsqRNmDrnNyhUfaMGLZkt1SwjStW39k+N6Z8KyHCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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