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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78049f84093731134969a47a0848c4840c1b354f5332693bf57760947436cd39' 
  AND token = 'SE18VhMMgDk4maH7OK4Xiuqhe6RkYKUEFI6PBej2xnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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