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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc8c7c315017205f2bf74b442f702ab57d4741daae29998acabe157f40440dc' 
  AND token = '6wPmLHaXRxHlQCOEi72EA73R1VAz+h54vv3pL58nQXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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