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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440842704be6c78a3e6a62ef856ff0aea966d8dd0597c4b75f260d2f68843bdb' 
  AND token = 'UfAQ5B7skEmbcjLhNP9XjogDrKcsaNTDdqgknwCWRoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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