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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39152a8af316c195968592edc67d7a18263c411f05f86f941ad3848485663765' 
  AND token = '/GFgDZVR0zvpW8JmOoSg1ae5iJmuX0GNdukdu3OnW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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