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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b3ebb9a9e6bb7aec5b48a495326a4119077457a63d904924a1683af7c7aaac' 
  AND token = 'ezPVo0BWRSE3/TfOvjpRtV+ru0diWba4ipbZ2JVT4hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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