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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf015f5cc33c8da73a4793be2fc890fff6601561c0f13b00cd8e9e333e8bb683' 
  AND token = 'ANk/WwOaDdMwX3K40n0JedFi3tm6QJY5CGINvYnlYoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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