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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693340380fff6f41603309a9b71b9e1206297d3b948175b69bb756bfecf2ed5f' 
  AND token = 'BfJVAX8RMpaiWFFCLiF6bw2eJz2yPtRUhK9K9LA9x4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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