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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b743bd756cb4a5d85e2759bffc585e4512e79d10ec76251dc3bc89499b29454' 
  AND token = 'sXaOyS93hH8JCjYleubMZr8kUFNGxh5KoVzk2DOv53U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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