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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7547c04a28194487859ec4b315ed4233cf38afc5d0216959042499aa54b858' 
  AND token = 'XwtkET5eUFsHf+hXwrBtyHLnKX0zQketNaZj+58Zzzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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