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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829e58451d9a31de4a71e7f6f2e702a23ddc307c194657eb7988d3ac494733d7' 
  AND token = 'iFw06YcXrduvoeF8gLPnIOgbGvW9mz+Eq4Pko25Tu18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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