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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b568d34e93a6ad96174e522a0c25bbd373dc8e0d303199d5863f9c931bf1e94' 
  AND token = 'n6ZIsDXmtnv+MWUdLe4aOo/OySau55rycGPMhAzsasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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