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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783f0f6b67b6277773c52cc795eb6260074b91a12cc197c8fb7f7a448d58efed' 
  AND token = 'DABRc65uX7xFHpu82lcN+vfh9j1XuAg3xmmg32FPGfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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