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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dd2a987e4fbf109054860cefd45657352dc4d63903babaa4997dca06e87065' 
  AND token = '/l8bZjw7zOOSkfc/khPieijONr2xFRIkKVTWaMRWLZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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