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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa11b44f60d978cbb79af31cd93153371445046661e8991bdf1faa5ad7906304' 
  AND token = 'BnelMPO33CH4bb7/0n3r9bYcAxMGl7SZQS3jQcC6KGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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