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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a47efd60c00923f004a6158c4b607ab10009dbff727ba2106911ba9ad073a68' 
  AND token = '6TmkAioYkEDPbBe7YmYnKjWoivJ5h5nPadNUJDy2oE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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