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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea3cb6d7bc531fd003bd120dd8ff00697e2f94e15c8d5ec845e59b5ecaeb672' 
  AND token = 'KrVOB6HWQI7JlihKTFJ/77iyPYadOeq0oYU+TyS1IwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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