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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99762a8519e6895d217beade15e7a67a7d6d52f694a1086a332a93f826d45e' 
  AND token = 'Rs1NSoX7Ja2JVSN0U/iE3oL9YuViZ82x150/5Q6liWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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