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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cfa131c91c8d019775eb3f02cd2dcb2ce79f9732721fdcc7aad64366395256' 
  AND token = 'TkMxNOuC78idb5dD9BWzHnyEK4hl2eoHSIN2l4vFqK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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