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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43a475b0399f20b0a5778e4a5b6b962464cc1c3942b0b385c26985e46bbb05e' 
  AND token = 'V+QB73GI6AD8sng6RZ+m8l6Y6WCDnEif5c2FLarRF54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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