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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe042317e00b4548ab97f77aad85c92718cd73d36ce82f2506fa4bb7285c5a1' 
  AND token = 'x5ucObhqfsB78WDSkMXHt3qjzEDEaIrcctgosPiJbcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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