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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371d064f40bda272c480ae461dad8ce824efaba25958d879303f4d8f7f4a0302' 
  AND token = 'Fzn5koEkZSWsTW84tA3WqNG68XbCMlSG6HgxgmVfu3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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