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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e068d6a391a9a849dbf477caba9cf10a04e69db95f64bd034c3445724a74ab3' 
  AND token = '3c5WH7qo4Kg/NrlvQik8DKWOVipmAqHlTG9xXasF2Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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