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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d873d604f372c2d8e9e58d8023c26a9de57ef4809d0c2733377790c48a17f9' 
  AND token = 'wr+8FcDbXbqNxgml1Y8/RUJ4pWijlmgEUWn6G98FdzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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