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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085e471324db1ba7d2ceef5201e8801714b8046fcff4afdb340373421492bf09' 
  AND token = 'VtnIzes2TeZgNG8tW8IS/Ye4dIO+ZvXIIvsHM+fQpW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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