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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0936ac2a58374590010a7e8e3444f9187f253cd0fc60dfe031414e4e4a475026' 
  AND token = 'IwIMYsodUVo4XIaj8wcK0/JXBZMG8RHn3HDUfWb5jMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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