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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba63a44d5b0af5ff5eb0c9fab185f82989c8d9896e91c97214673656a69774' 
  AND token = 'YtK4tVPVwHca4oMMsKDpfLfbxi2w92H1DZi2B45gVuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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