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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6994bf0503541fd491edf0a6166337c2ae407ed24da73f98c8e64b6719e93a7' 
  AND token = 'cK4JoIMmfn6DFFKZgXISlgXZ3bP1X6XttSxzsuja1v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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