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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840a92ade788aae4186f8f6168d9401e49cabc61366c040fb13c9dbe5bb34e5d' 
  AND token = 'SiwqXl4+vCkxHMwsO+sxvhMtENOadvG7ZusKgZQcI2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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