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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c4de2ea9ce592ed75ad595bfa62dc8b017d8c9286405ede2a8359faa10e313' 
  AND token = 'xkwmrYnINiBrp8qXdNIhF5ejJjpnEJJRdp+mIXinEcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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