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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bdb0e209437da655aa6843239434968c286ea4cce6dc58194dadce4b6df46f' 
  AND token = 'tKGExmpdknxfEEQin9daIl/UV1bccL0de/88rXD32Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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