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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1994313b97a5d55fc2eda81ad4a34f78758901771c48b8df354aa540c3001bdb' 
  AND token = 'l3/cAyNEOqvbx3b9ZWOFinkWXPt/DCKtTzMP4/Ypnn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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