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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d20944581f1a29a3d029a9ab799d651387b44ace792b9768b4a192a0d87b21' 
  AND token = 'kER1UlHdKEs0HjFM56eVFIhpBt74Tu2JCEtOSQ9vqEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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