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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d853c1d09436a5f47160a77b753eb49f7ff6a393f47e5ce8baa3a7d83baf1b' 
  AND token = 'z0KMaNwNd3rLGuHFokSgspDuMPDirbD61r+3WNcP9qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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