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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5999ee96285ffdb8794845364cce58a81b2dca696a018fd2bc660db3ca11aed4' 
  AND token = 'ZHfSOD8OrSZsTiaLmSB+3xx3el7Ca/7vJS7vbHregXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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