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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc73de4f2f19d299f9a358262f37315dd7abdf2d6572e5c4cc71fb503e934517' 
  AND token = '1oVmQHEvuaqVfayl7FgX5qWw+nb9d+w8L8HlFzsEQAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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