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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1a67458aecb9ec855673cfd9a45f24f2f8e132ab7d3f0c0ab8a2346711ba7f' 
  AND token = 'IPw/UBxrnW8x0wikervu/Ti60cQpU8jvuCEsCt3lZJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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